When users try to restore XP .bkf file in Windows 7 through NT Backup Restore Utility for Windows 7, but you get an error message “the backup file contains unrecognized data and cannot be used” while restoring BKF file, because this BKF file got corrupted in your Windows 7. In this situation, you should try BKF repair tool which is perfect solution to fix your BKF error issues in your system. VSS interface is one more difficulty of computer users which occurs at that time when you try to extract or restore Windows XP backup files in Windows 7 Operating System. So, if you need to restore XP files using NTBackup utility but unable to carry on this process owing to mis-functioning then use BKF Repair tool. Backup file contains unrecognized data - this message can be happen due to many reasons like: CRC errors, Virus attack, and so on but you can resolve it by one solution and that is BKF Repair tool. So, use it to repair corrupted Windows NTBackup files. If you want to verify this software before investing in its full version then download its fully free demo version and assessment it and view the complete corrupted database which is inside .bkf files. For full recovery process, purchase its licensed version at just $89.